ASP.net JavaScript - Google Maps API

[andrec84j]

Possuo uma página onde exibo alguns marcadores em um mapa, ao tentar realizar a atualização das posições dos makers não consigo atualizar os valores via javascript.
A variável sempre mantem o valor anterior.

Alguém conseguiria me ajudar com esse problema?

Código:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="mapas_google_api.aspx.vb" Inherits="MCWReportV2.mapas_google_api" %>

<title></title> <script type="text/javascript" src="/_reports/_controles/jquery-3.3.1.min.js"></script> <script type="text/javascript" src="/_reports/_controles/jquery-3.3.1.min.js"></script>

        <script>

            function initialize()
            {
                var map, infoWindow, marker, myLatlng
                var markersArray = []
                var markers = []
                var data
                markersArray = JSON.parse('<%=Session("markers_api")%>');
                var mapOptions = {
                    center: new google.maps.LatLng(markersArray[0].lat, markersArray[0].lng),
                    mapTypeId: google.maps.MapTypeId.ROADMAP,
                    zoom: 13,
                    mapTypeId: 'satellite',
                    marker: true
                };

                infoWindow = new google.maps.InfoWindow();
                map = new google.maps.Map(document.getElementById("map"), mapOptions);

                 for (i = 0; i < markersArray.length; i++) {
                    data = markersArray[i]
                    myLatlng = new google.maps.LatLng(data.lat, data.lng);
                    icon = "../../imagens/mapas/" + data.icone + ".png";
                    marker = new google.maps.Marker({
                        position: myLatlng,
                        map: map,
                        scaledSize: new google.maps.Size(20, 20),
                        title: data.title,
                        draggable: true,
                        icon: new google.maps.MarkerImage(icon)
                    });

                    (function (marker, data) {
                        google.maps.event.addListener(marker, "click", function (e) {
                        infoWindow.setContent(data.description);
                        infoWindow.open(map, marker);
                    });
                     })(marker, data);
                     markers.push(marker);
                }

                setInterval(function () {

                     markersArray = []
                     markersArray = JSON.parse('<%=Session("markers_api")%>')
                     for (i = 0; i < markersArray.length; i++) {
                         markers[i].setPosition(new google.maps.LatLng(markersArray[i].lat, markersArray[i].lng));
                    }

                }, 5000);  

            }
            window.onload = initialize;

        </script>
    </header> 
    <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
    
    <section id="content" class="table-layout animated fadeIn">
        <div class="clearfix"></div>
        <div class="Content" style="width: 100%; vertical-align: middle">
            <asp:button ID="atualizar" runat="server" Text="Atualizar" BackColor="Red" ForeColor="White"></asp:button>
            <script type="text/javascript" src = "https://maps.googleapis.com/maps/api/js?v=3.31&key=AIzaSyB-gf7cYevPPkvL1QCH0vhxMk0l1RN3kWM&sensor=false"></script>
            <div id="map" style="width: 100%; height: 1024px"></div>
        </div>
    </section>
</form>